Crash when using @Shared appStorage during certain conditions

[zachwaugh]

Description

I'm seeing a crash with a similar backtrace to https://github.com/pointfreeco/swift-composable-architecture/issues/3247, but appears not to be caused by a thread issue.

I'm using a @Shared appStorage key roughly like:

@Shared(.appStorage("key")) var isEnabled: Bool = true

When launching the app it crashes. I'm still working on a simplified repro but having a hard time isolating the exact code causing the problem, but thought I'd post the issue in case anyone else has an idea.

If you look at the backtrace, it appears an NSAttributedString is performing layout (which isn't in my code) which triggers an NSUserDefault update which in turn causes the @Shared storage to update immediately during the same render cycle?The only relevant logs related to the crash are:

precondition failure: setting value during update: 219864

Checklist

• [ ] I have determined whether this bug is also reproducible in a vanilla SwiftUI project.
• [ ] If possible, I've reproduced the issue using the main branch of this package.
• [X] This issue hasn't been addressed in an existing GitHub issue or discussion.

Expected behavior

No response

Actual behavior

No response

Steps to reproduce

No response

The Composable Architecture version information

1.13.1

Destination operating system

iOS 17.5

Xcode version information

Xcode 15.4

Swift Compiler version information

No response